LED Package Groove Reflector for Lateral Light Extraction
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Solution Overview
Problem
Existing light emitting devices have limitations in achieving high light emission efficiency due to inefficiencies in light reflection and extraction from the lateral surfaces of the light emitting elements.
Innovation Solution
A light emitting device design featuring a substrate with a grooved part surrounding a region, where a reflecting material-containing layer is settled in the groove using centrifugal force, and a light transmitting layer covers the lateral surfaces of the light emitting element, enhancing light reflection and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light emitting device uses conventional packaging without grooved parts, then the structure is simple and easy to manufacture, but light emission efficiency is low due to poor light reflection and extraction from lateral surfaces
Solution Approach 1:
The packaging structure is segmented into multiple functional regions: a grooved part surrounding the light emitting element, a reflecting material-containing layer settled in the groove, and a light transmitting layer covering the lateral surfaces. This segmentation allows each region to perform its specific function optimally, resolving the contradiction between structural simplicity and light emission efficiency.
Solution Approach 2:
Different regions of the packaging are given different local qualities: the grooved part provides structural definition, the reflecting material-containing layer provides high reflectance, and the light transmitting layer provides light extraction. This local differentiation enables the packaging to simultaneously achieve structural simplicity and high light emission efficiency.
2Productivity
If a light emitting device uses a reflecting material-containing layer settled in a groove, then light reflection from lateral surfaces is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The grooved part is formed in advance during packaging manufacturing, and the reflecting material-containing layer is settled into the groove before the light transmitting layer is applied. This preliminary arrangement of materials in their final positions simplifies the overall manufacturing process while achieving high light reflection efficiency.
Solution Approach 2:
The packaging uses a composite structure combining the reflecting material-containing layer with the light transmitting layer. This composite material approach allows the system to achieve both high reflectance and effective light extraction without requiring separate complex manufacturing steps for each function.
3Productivity
If a light emitting device uses a light transmitting layer covering lateral surfaces, then light extraction is enhanced, but color non-uniformity increases without proper light reflection control
Solution Approach 1:
The reflecting material-containing layer acts as an intermediary between the light emitting element and the light transmitting layer. It first reflects light from the lateral surfaces, then directs it through the light transmitting layer, ensuring both enhanced extraction and maintained color uniformity. This intermediary function resolves the contradiction between light extraction efficiency and color uniformity.
Solution Approach 2:
The combination of the reflecting material-containing layer and light transmitting layer creates a continuous light management system that maintains consistent optical performance across the packaging. This continuity ensures uniform color distribution while maximizing light extraction efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly increases light emission efficiency by improving light reflection and extraction from the lateral surfaces, leading to enhanced light distribution characteristics and reduced color non-uniformity.
Implementation Method 1
a reflecting material-containing layer which contains a first reflecting material settled in the groove
Implementation Method 2
a light transmitting layer which covers at least a portion of the lateral surfaces of the light emitting element
Implementation Method 3
a first cover member which includes a reflecting material-containing layer containing a first reflecting material settled in the groove
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
A light emitting device includes: a substrate including a grooved part surrounding a first region; a light emitting element mounted in the first region; a first cover member comprising: a reflecting material-containing layer that is disposed in the groove of the grooved part and that contains a first reflecting material, and a light transmitting layer that covers at least a portion of lateral surfaces of the light emitting element; and a light transmitting member disposed on the first cover member and the light emitting element